It is 1 month after the Battle of Hogwarts, with Harry, asked by Ron, to live with them. Arthur Weasley gets tickets to the Quidditch World Cup, where he takes his family, Harry, Hermione, and Kreacher. Before the match, Harry meets the new DADA teacher, Barry Cox (made up character) but Harry soon gets suspicious of him. When Harry, Ron, Hermione, Ginny, Neville, Luna, Dean, and Seamus return to Hogwarts, Seamus goes with Hermione and Neville to a secret room where Seamus finds a special locket but doesn't tell anyone. At Hogmeade, Harry and Ron witness Seamus being tortured as if an invisible hand had been strangling him. Seamus tells them everything after Harry and Ron rescue him. Harry and the group find out who the locket really belongs to, and it comes to them as a real shock.